A) To magnify objects directly.
B) To track satellites.
C) To take pictures of the moon.
D) To gather and focus light.

A) The length of the telescope tube.
B) The diameter of the objective lens or mirror.
C) The weight of the telescope.
D) The magnification power of the eyepiece.

A) Radio telescope.
B) Refracting telescope.
C) Reflecting telescope.
D) Catadioptric telescope.

A) Catadioptric telescope.
B) Radio telescope.
C) Reflecting telescope.
D) Refracting telescope.

A) The length of the telescope tube.
B) The distance between the lens/mirror and the focal point.
C) The magnification of the telescope.
D) The width of the lens/mirror.

A) To focus light into the telescope.
B) To filter out unwanted light.
C) To magnify the image formed by the objective.
D) To gather light from distant objects.

A) Focal length of eyepiece / Focal length of objective.
B) Focal length of objective + Focal length of eyepiece.
C) Focal length of objective / Focal length of eyepiece.
D) Focal length of objective * Focal length of eyepiece.

A) The brightness of the target object.
B) The clarity of the telescope lens.
C) The observer's eyesight.
D) The steadiness of the atmosphere.

A) The natural light emitted by stars.
B) Excessive artificial light that obscures the night sky.
C) The reflection of sunlight off the moon.
D) The aurora borealis.

A) Equatorial mount.
B) Eyepiece mount.
C) Lens mount.
D) Mirror mount.

A) Allows the telescope to move up and down only.
B) Tracks celestial objects as the Earth rotates.
C) Allows the telescope to rotate horizontally only.
D) Keeps the telescope perfectly still.

A) Planets.
B) Double stars.
C) The Moon's craters.
D) Nebula.

A) Galaxies.
B) Nebula.
C) Planets.
D) Star clusters.

A) Aligning the optical elements of a telescope.
B) Calculating the telescope's magnification.
C) Polishing the telescope lens.
D) Attaching the telescope to the mount.

A) To achieve the sharpest possible image.
B) To increase the telescope's magnification.
C) To make the telescope easier to carry.
D) To protect the telescope from dust.

A) Helps you locate objects in the sky.
B) Automatically tracks stars.
C) Magnifies the image more than the eyepiece.
D) Filters out light pollution.

A) Moon filter.
B) Color filter.
C) Solar filter.
D) Light pollution filter.

A) Look at a bright star.
B) Look directly at the Sun.
C) Look at the Moon.
D) Look at a planet.

A) To block out light pollution.
B) To prevent dew from forming on the lens.
C) To protect the telescope from rain.
D) To make the telescope more stable.

A) During the day.
B) During twilight.
C) As soon as the sun sets.
D) After the sky is completely dark.

A) Traveling between different star systems.
B) Observing shooting stars.
C) Observing stars with a binocular.
D) Using a star chart to find faint objects.

A) Millimeters or Inches.
B) Light-years.
C) Astronomical Units (AU).
D) Parsecs.

A) Orthoscopic eyepiece.
B) Wide-field eyepiece.
C) Huygenian eyepiece.
D) Plossl eyepiece.

A) Maksutov-Cassegrain telescope.
B) Schmidt-Cassegrain telescope.
C) Dobsonian telescope.
D) Newtonian telescope.

A) Use your breath and a clean shirt.
B) Use regular household cleaner.
C) Use a paper towel.
D) Use a specialized lens cleaning solution and cloth.

A) The faintest star visible through the telescope.
B) The brightest star visible through the telescope.
C) The maximum magnification of the telescope.
D) The distance the telescope can see.

A) Gravitational waves.
B) Solar flares.
C) Electromagnetic radiation.
D) Atmospheric turbulence.

A) Taking pictures of celestial objects.
B) Drawing pictures of celestial objects.
C) Measuring the positions of stars.
D) Studying the chemical composition of stars.

A) To measure the speed of stars.
B) To find the North Star.
C) To accurately align an equatorial mount.
D) To prevent the telescope from drifting.

A) Hydrogen-alpha filter.
B) Solar filter.
C) Moon filter.
D) Light pollution filter.